<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="../vue.js"></script>
  </head>

  <body>
    <div id="app">
      <input type="text" v-model="search" />
      <ul>
        <li v-for="item in newPerson" :key="item.id">
          {{item.name}}--{{item.age}}
        </li>
      </ul>
    </div>
    <script>
      Vue.config.productionTip = false;

      const vm = new Vue({
        el: "#app",
        data() {
          return {
            search: "",
            person: [
              { id: "001", name: "laowang", age: 18 },
              { id: "002", name: "xiaowang", age: 12 },
              { id: "003", name: "dawang", age: 33 },
              { id: "004", name: "xiaohuang", age: 6 },
            ],
            newPerson: [],
          };
        },
        watch: {
          search: {
            immediate: true,
            handler(newValue) {
              this.newPerson = this.person.filter((item) => {
                return item.name.includes(newValue);
              });
            },
          },
        },
      });
    </script>
  </body>
</html>
